package com.tom;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Servlet Filter implementation class LogFilter
 */
public class LogFilter implements Filter {
	Log log = LogFactory.getLog("LogFilter");
	String filterName;
	

	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
		filterName = fConfig.getFilterName();
		log.info("開始:"+fConfig.getFilterName());
		
	}
    /**
     * Default constructor. 
     */
    public LogFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here

		// pass the request along the filter chain
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse rsp = (HttpServletResponse) response;
		
		long startTime = System.currentTimeMillis();
		String requestURI = req.getRequestURI();
	
		chain.doFilter(request, response);
		long endTime=System.currentTimeMillis();
		
		log.info(request.getRemoteAddr() + " 存取了" + requestURI + ",總用時" + (endTime-startTime) + "毫秒。");
		
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void destroy() {
		// TODO Auto-generated method stub
		log.info("關閉 Filter: " + filterName);
	}

}
